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+(** THIS FILE WAS AUTOMATICALLY GENERATED BY AENEAS *)
+(** [paper] *)
+module Paper
+open Primitives
+
+#set-options "--z3rlimit 50 --fuel 1 --ifuel 1"
+
+(** [paper::ref_incr]: merged forward/backward function
+    (there is a single backward function, and the forward function returns ())
+    Source: 'src/paper.rs', lines 4:0-4:28 *)
+let ref_incr (x : i32) : result i32 =
+  i32_add x 1
+
+(** [paper::test_incr]: forward function
+    Source: 'src/paper.rs', lines 8:0-8:18 *)
+let test_incr : result unit =
+  let* x = ref_incr 0 in if not (x = 1) then Fail Failure else Return ()
+
+(** Unit test for [paper::test_incr] *)
+let _ = assert_norm (test_incr = Return ())
+
+(** [paper::choose]: forward function
+    Source: 'src/paper.rs', lines 15:0-15:70 *)
+let choose (t : Type0) (b : bool) (x : t) (y : t) : result t =
+  if b then Return x else Return y
+
+(** [paper::choose]: backward function 0
+    Source: 'src/paper.rs', lines 15:0-15:70 *)
+let choose_back
+  (t : Type0) (b : bool) (x : t) (y : t) (ret : t) : result (t & t) =
+  if b then Return (ret, y) else Return (x, ret)
+
+(** [paper::test_choose]: forward function
+    Source: 'src/paper.rs', lines 23:0-23:20 *)
+let test_choose : result unit =
+  let* z = choose i32 true 0 0 in
+  let* z1 = i32_add z 1 in
+  if not (z1 = 1)
+  then Fail Failure
+  else
+    let* (x, y) = choose_back i32 true 0 0 z1 in
+    if not (x = 1)
+    then Fail Failure
+    else if not (y = 0) then Fail Failure else Return ()
+
+(** Unit test for [paper::test_choose] *)
+let _ = assert_norm (test_choose = Return ())
+
+(** [paper::List]
+    Source: 'src/paper.rs', lines 35:0-35:16 *)
+type list_t (t : Type0) =
+| List_Cons : t -> list_t t -> list_t t
+| List_Nil : list_t t
+
+(** [paper::list_nth_mut]: forward function
+    Source: 'src/paper.rs', lines 42:0-42:67 *)
+let rec list_nth_mut (t : Type0) (l : list_t t) (i : u32) : result t =
+  begin match l with
+  | List_Cons x tl ->
+    if i = 0 then Return x else let* i1 = u32_sub i 1 in list_nth_mut t tl i1
+  | List_Nil -> Fail Failure
+  end
+
+(** [paper::list_nth_mut]: backward function 0
+    Source: 'src/paper.rs', lines 42:0-42:67 *)
+let rec list_nth_mut_back
+  (t : Type0) (l : list_t t) (i : u32) (ret : t) : result (list_t t) =
+  begin match l with
+  | List_Cons x tl ->
+    if i = 0
+    then Return (List_Cons ret tl)
+    else
+      let* i1 = u32_sub i 1 in
+      let* tl1 = list_nth_mut_back t tl i1 ret in
+      Return (List_Cons x tl1)
+  | List_Nil -> Fail Failure
+  end
+
+(** [paper::sum]: forward function
+    Source: 'src/paper.rs', lines 57:0-57:32 *)
+let rec sum (l : list_t i32) : result i32 =
+  begin match l with
+  | List_Cons x tl -> let* i = sum tl in i32_add x i
+  | List_Nil -> Return 0
+  end
+
+(** [paper::test_nth]: forward function
+    Source: 'src/paper.rs', lines 68:0-68:17 *)
+let test_nth : result unit =
+  let l = List_Nil in
+  let l1 = List_Cons 3 l in
+  let l2 = List_Cons 2 l1 in
+  let* x = list_nth_mut i32 (List_Cons 1 l2) 2 in
+  let* x1 = i32_add x 1 in
+  let* l3 = list_nth_mut_back i32 (List_Cons 1 l2) 2 x1 in
+  let* i = sum l3 in
+  if not (i = 7) then Fail Failure else Return ()
+
+(** Unit test for [paper::test_nth] *)
+let _ = assert_norm (test_nth = Return ())
+
+(** [paper::call_choose]: forward function
+    Source: 'src/paper.rs', lines 76:0-76:44 *)
+let call_choose (p : (u32 & u32)) : result u32 =
+  let (px, py) = p in
+  let* pz = choose u32 true px py in
+  let* pz1 = u32_add pz 1 in
+  let* (px1, _) = choose_back u32 true px py pz1 in
+  Return px1
+